DURIP High Speed Laser Diagnostics for Multiphase Turbulent Combustion of Enabling Fuels for Naval Decarbonization
Abstract
This proposal requests to purchase a 10 kHz, simultaneous flow field and multi-species laser diagnostic system comprising a high repetitive rate Nd:YAG laser, a high repetitive rate Nd:YLF dual cavity laser, a Sirah Credo dye laser, and a CMOS image intensified high-speed camera. The requested equipment will enable simultaneous measurements of flow velocity (PIV) and key intermediate species (OH and CH2O by PLIF) in multiphase turbulent combustion of enabling fuels for naval decarbonization.As an enabling fuel for decarbonization, ammonia (NH3) has a great potential, however, also imposes unforeseen technical challenges due to its unique combustion characteristics, originating from 1) low volumetric and gravimetric energy densities, 2) slow overall reactivity (e.g. slow laminar flame speed, higher ignition temperature, narrower flammability limits), and 3) high NOx production through fuel-specific oxidation reactions. In the case of Navy applications, it is also important to investigate combustion behaviors of a mixture of ammonia and jet fuel pertinent to the transient operation between neat ammonia and jet fuel. Therefore, it is critical to establish a fundamental knowledge for appropriately evaluating the impacts of ammonia addition to jet fuel mixtures on both global combustion behavior and detailed chemical kinetic characteristics.Optimization of a gas turbine combustor and/or a marine diesel engine through applied CFD simulations in a broad range of operation envelopes and fuel mixtures must encompass the dynamics of startup, full load, and significant turndown capabilities. The accurate chemical kinetic model ought to be capable of fruitfully representing the dynamics of the radical pool, so that it can adequately represent operating envelopes. While a chemical kinetic model can be developed either theoretically or numerically through validation against canonical reactor experiments, its prediction fidelity in realistic operation conditions can be only evaluated through the comparison to sophisticated experimental results that can provide temporal and spatial variation of combustion dynamics. In this regard, the acquisition of a high-speed laser diagnostic system proposed here is critical for achieving the goals of the current ONR funded program.The new instrumentation will be integrated with the existing laser diagnostic system to investigate the combustion dynamics in multiphase turbulent flame regimes through measuring quantitatively the instantaneous structures of flame and flow field. The experimental results will advance fundamental understanding of combustion dynamics and chemistry of ammonia and its mixture with jet fuel and will provide detailed experimental data for chemical kinetic model validation. The work will be conducted at the University of South Carolina. Education: The development of the new diagnostic approach will provide opportunities the undergraduate and graduate education and research.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 15, 2024
- Source ID
- N000142412148
Entities
People
- Sang Hee Won
Organizations
- Office of Naval Research
- United States Navy
- University of South Carolina